One year olds have emotional needs that need to be met, and if he screams when you put him down, it is because he feels safe and secure in your arms. If he is in daycare (no judgment here- my children go too), he probably misses you and WANTS to be with you all the time. This is totally normal, and he is NOT "playing you." (Sorry to go against the grain, but I just don't buy that...)
Children go through different stages of separation anxiety, and 12 months is a rough one. 15 can be bad, and 18 months can be the worst. Just saying, it might get better and then get worse over the next 6 months, but it WILL get better. Especially if he knows he can trust you to meet his needs.
The best thing you can do for him when he is going through stages of separation is be there for him. YES it is hard to do ALL the time. And YES there will be times when you simply cannot just hold him. But if you just talk to him and say things like, "I'm going to put you down for a few minutes but when I'm finished with ____, I can pick you up again." Then follow through. Encourage him to follow you if you have to go to another room, and give him time to get there so you don't go behind a corner and he can't see you anymore.
I find that if I change my outlook or attitude, it makes a world of difference. So don't think of it is that he is turning psycho, just think of it as he is a baby who needs his mommy right now. This too shall pass...!